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Lennox 75M21 Hot Surface Ignitor.. . 20 Second Warm up. Ignitor Resistance: min 50m max 450 Ohms @ 25C. Replaces 75M2101. Use on most of these series G40DF-24A G40DF-36A G40DF-48C G40DF-60C G40DF-60D G40UH-24A G40UH-36A. G40UH-36B G40UH-36C G40UH-48B G40UH-48C G40UH-60C G40UIH-60D G43UF-24B G43UF-36B G43UF-48C. G43UF-60D. . Caution!. Ignitors also referred to as Igniters should be handled with care as the ends are very fragile.